1 /* 2 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #include "xfs.h" 19 #include "xfs_fs.h" 20 #include "xfs_shared.h" 21 #include "xfs_format.h" 22 #include "xfs_log_format.h" 23 #include "xfs_trans_resv.h" 24 #include "xfs_sb.h" 25 #include "xfs_mount.h" 26 #include "xfs_da_format.h" 27 #include "xfs_da_btree.h" 28 #include "xfs_inode.h" 29 #include "xfs_trans.h" 30 #include "xfs_inode_item.h" 31 #include "xfs_error.h" 32 #include "xfs_btree.h" 33 #include "xfs_alloc_btree.h" 34 #include "xfs_alloc.h" 35 #include "xfs_ialloc.h" 36 #include "xfs_fsops.h" 37 #include "xfs_itable.h" 38 #include "xfs_trans_space.h" 39 #include "xfs_rtalloc.h" 40 #include "xfs_trace.h" 41 #include "xfs_log.h" 42 #include "xfs_filestream.h" 43 44 /* 45 * File system operations 46 */ 47 48 int 49 xfs_fs_geometry( 50 xfs_mount_t *mp, 51 xfs_fsop_geom_t *geo, 52 int new_version) 53 { 54 55 memset(geo, 0, sizeof(*geo)); 56 57 geo->blocksize = mp->m_sb.sb_blocksize; 58 geo->rtextsize = mp->m_sb.sb_rextsize; 59 geo->agblocks = mp->m_sb.sb_agblocks; 60 geo->agcount = mp->m_sb.sb_agcount; 61 geo->logblocks = mp->m_sb.sb_logblocks; 62 geo->sectsize = mp->m_sb.sb_sectsize; 63 geo->inodesize = mp->m_sb.sb_inodesize; 64 geo->imaxpct = mp->m_sb.sb_imax_pct; 65 geo->datablocks = mp->m_sb.sb_dblocks; 66 geo->rtblocks = mp->m_sb.sb_rblocks; 67 geo->rtextents = mp->m_sb.sb_rextents; 68 geo->logstart = mp->m_sb.sb_logstart; 69 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid)); 70 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid)); 71 if (new_version >= 2) { 72 geo->sunit = mp->m_sb.sb_unit; 73 geo->swidth = mp->m_sb.sb_width; 74 } 75 if (new_version >= 3) { 76 geo->version = XFS_FSOP_GEOM_VERSION; 77 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK | 78 XFS_FSOP_GEOM_FLAGS_DIRV2 | 79 (xfs_sb_version_hasattr(&mp->m_sb) ? 80 XFS_FSOP_GEOM_FLAGS_ATTR : 0) | 81 (xfs_sb_version_hasquota(&mp->m_sb) ? 82 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) | 83 (xfs_sb_version_hasalign(&mp->m_sb) ? 84 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) | 85 (xfs_sb_version_hasdalign(&mp->m_sb) ? 86 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) | 87 (xfs_sb_version_hasextflgbit(&mp->m_sb) ? 88 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) | 89 (xfs_sb_version_hassector(&mp->m_sb) ? 90 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) | 91 (xfs_sb_version_hasasciici(&mp->m_sb) ? 92 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) | 93 (xfs_sb_version_haslazysbcount(&mp->m_sb) ? 94 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) | 95 (xfs_sb_version_hasattr2(&mp->m_sb) ? 96 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) | 97 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ? 98 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) | 99 (xfs_sb_version_hascrc(&mp->m_sb) ? 100 XFS_FSOP_GEOM_FLAGS_V5SB : 0) | 101 (xfs_sb_version_hasftype(&mp->m_sb) ? 102 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) | 103 (xfs_sb_version_hasfinobt(&mp->m_sb) ? 104 XFS_FSOP_GEOM_FLAGS_FINOBT : 0) | 105 (xfs_sb_version_hassparseinodes(&mp->m_sb) ? 106 XFS_FSOP_GEOM_FLAGS_SPINODES : 0); 107 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ? 108 mp->m_sb.sb_logsectsize : BBSIZE; 109 geo->rtsectsize = mp->m_sb.sb_blocksize; 110 geo->dirblocksize = mp->m_dir_geo->blksize; 111 } 112 if (new_version >= 4) { 113 geo->flags |= 114 (xfs_sb_version_haslogv2(&mp->m_sb) ? 115 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0); 116 geo->logsunit = mp->m_sb.sb_logsunit; 117 } 118 return 0; 119 } 120 121 static struct xfs_buf * 122 xfs_growfs_get_hdr_buf( 123 struct xfs_mount *mp, 124 xfs_daddr_t blkno, 125 size_t numblks, 126 int flags, 127 const struct xfs_buf_ops *ops) 128 { 129 struct xfs_buf *bp; 130 131 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags); 132 if (!bp) 133 return NULL; 134 135 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 136 bp->b_bn = blkno; 137 bp->b_maps[0].bm_bn = blkno; 138 bp->b_ops = ops; 139 140 return bp; 141 } 142 143 static int 144 xfs_growfs_data_private( 145 xfs_mount_t *mp, /* mount point for filesystem */ 146 xfs_growfs_data_t *in) /* growfs data input struct */ 147 { 148 xfs_agf_t *agf; 149 struct xfs_agfl *agfl; 150 xfs_agi_t *agi; 151 xfs_agnumber_t agno; 152 xfs_extlen_t agsize; 153 xfs_extlen_t tmpsize; 154 xfs_alloc_rec_t *arec; 155 xfs_buf_t *bp; 156 int bucket; 157 int dpct; 158 int error, saved_error = 0; 159 xfs_agnumber_t nagcount; 160 xfs_agnumber_t nagimax = 0; 161 xfs_rfsblock_t nb, nb_mod; 162 xfs_rfsblock_t new; 163 xfs_rfsblock_t nfree; 164 xfs_agnumber_t oagcount; 165 int pct; 166 xfs_trans_t *tp; 167 168 nb = in->newblocks; 169 pct = in->imaxpct; 170 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100) 171 return -EINVAL; 172 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb))) 173 return error; 174 dpct = pct - mp->m_sb.sb_imax_pct; 175 error = xfs_buf_read_uncached(mp->m_ddev_targp, 176 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), 177 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL); 178 if (error) 179 return error; 180 xfs_buf_relse(bp); 181 182 new = nb; /* use new as a temporary here */ 183 nb_mod = do_div(new, mp->m_sb.sb_agblocks); 184 nagcount = new + (nb_mod != 0); 185 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { 186 nagcount--; 187 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks; 188 if (nb < mp->m_sb.sb_dblocks) 189 return -EINVAL; 190 } 191 new = nb - mp->m_sb.sb_dblocks; 192 oagcount = mp->m_sb.sb_agcount; 193 194 /* allocate the new per-ag structures */ 195 if (nagcount > oagcount) { 196 error = xfs_initialize_perag(mp, nagcount, &nagimax); 197 if (error) 198 return error; 199 } 200 201 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS); 202 tp->t_flags |= XFS_TRANS_RESERVE; 203 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growdata, 204 XFS_GROWFS_SPACE_RES(mp), 0); 205 if (error) { 206 xfs_trans_cancel(tp); 207 return error; 208 } 209 210 /* 211 * Write new AG headers to disk. Non-transactional, but written 212 * synchronously so they are completed prior to the growfs transaction 213 * being logged. 214 */ 215 nfree = 0; 216 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { 217 __be32 *agfl_bno; 218 219 /* 220 * AG freespace header block 221 */ 222 bp = xfs_growfs_get_hdr_buf(mp, 223 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), 224 XFS_FSS_TO_BB(mp, 1), 0, 225 &xfs_agf_buf_ops); 226 if (!bp) { 227 error = -ENOMEM; 228 goto error0; 229 } 230 231 agf = XFS_BUF_TO_AGF(bp); 232 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 233 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 234 agf->agf_seqno = cpu_to_be32(agno); 235 if (agno == nagcount - 1) 236 agsize = 237 nb - 238 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); 239 else 240 agsize = mp->m_sb.sb_agblocks; 241 agf->agf_length = cpu_to_be32(agsize); 242 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 243 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 244 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 245 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 246 agf->agf_flfirst = 0; 247 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1); 248 agf->agf_flcount = 0; 249 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp); 250 agf->agf_freeblks = cpu_to_be32(tmpsize); 251 agf->agf_longest = cpu_to_be32(tmpsize); 252 if (xfs_sb_version_hascrc(&mp->m_sb)) 253 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid); 254 255 error = xfs_bwrite(bp); 256 xfs_buf_relse(bp); 257 if (error) 258 goto error0; 259 260 /* 261 * AG freelist header block 262 */ 263 bp = xfs_growfs_get_hdr_buf(mp, 264 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)), 265 XFS_FSS_TO_BB(mp, 1), 0, 266 &xfs_agfl_buf_ops); 267 if (!bp) { 268 error = -ENOMEM; 269 goto error0; 270 } 271 272 agfl = XFS_BUF_TO_AGFL(bp); 273 if (xfs_sb_version_hascrc(&mp->m_sb)) { 274 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC); 275 agfl->agfl_seqno = cpu_to_be32(agno); 276 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid); 277 } 278 279 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp); 280 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++) 281 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK); 282 283 error = xfs_bwrite(bp); 284 xfs_buf_relse(bp); 285 if (error) 286 goto error0; 287 288 /* 289 * AG inode header block 290 */ 291 bp = xfs_growfs_get_hdr_buf(mp, 292 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), 293 XFS_FSS_TO_BB(mp, 1), 0, 294 &xfs_agi_buf_ops); 295 if (!bp) { 296 error = -ENOMEM; 297 goto error0; 298 } 299 300 agi = XFS_BUF_TO_AGI(bp); 301 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 302 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 303 agi->agi_seqno = cpu_to_be32(agno); 304 agi->agi_length = cpu_to_be32(agsize); 305 agi->agi_count = 0; 306 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 307 agi->agi_level = cpu_to_be32(1); 308 agi->agi_freecount = 0; 309 agi->agi_newino = cpu_to_be32(NULLAGINO); 310 agi->agi_dirino = cpu_to_be32(NULLAGINO); 311 if (xfs_sb_version_hascrc(&mp->m_sb)) 312 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid); 313 if (xfs_sb_version_hasfinobt(&mp->m_sb)) { 314 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp)); 315 agi->agi_free_level = cpu_to_be32(1); 316 } 317 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 318 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 319 320 error = xfs_bwrite(bp); 321 xfs_buf_relse(bp); 322 if (error) 323 goto error0; 324 325 /* 326 * BNO btree root block 327 */ 328 bp = xfs_growfs_get_hdr_buf(mp, 329 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), 330 BTOBB(mp->m_sb.sb_blocksize), 0, 331 &xfs_allocbt_buf_ops); 332 333 if (!bp) { 334 error = -ENOMEM; 335 goto error0; 336 } 337 338 if (xfs_sb_version_hascrc(&mp->m_sb)) 339 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1, 340 agno, XFS_BTREE_CRC_BLOCKS); 341 else 342 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1, 343 agno, 0); 344 345 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); 346 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 347 arec->ar_blockcount = cpu_to_be32( 348 agsize - be32_to_cpu(arec->ar_startblock)); 349 350 error = xfs_bwrite(bp); 351 xfs_buf_relse(bp); 352 if (error) 353 goto error0; 354 355 /* 356 * CNT btree root block 357 */ 358 bp = xfs_growfs_get_hdr_buf(mp, 359 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), 360 BTOBB(mp->m_sb.sb_blocksize), 0, 361 &xfs_allocbt_buf_ops); 362 if (!bp) { 363 error = -ENOMEM; 364 goto error0; 365 } 366 367 if (xfs_sb_version_hascrc(&mp->m_sb)) 368 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1, 369 agno, XFS_BTREE_CRC_BLOCKS); 370 else 371 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1, 372 agno, 0); 373 374 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); 375 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 376 arec->ar_blockcount = cpu_to_be32( 377 agsize - be32_to_cpu(arec->ar_startblock)); 378 nfree += be32_to_cpu(arec->ar_blockcount); 379 380 error = xfs_bwrite(bp); 381 xfs_buf_relse(bp); 382 if (error) 383 goto error0; 384 385 /* 386 * INO btree root block 387 */ 388 bp = xfs_growfs_get_hdr_buf(mp, 389 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), 390 BTOBB(mp->m_sb.sb_blocksize), 0, 391 &xfs_inobt_buf_ops); 392 if (!bp) { 393 error = -ENOMEM; 394 goto error0; 395 } 396 397 if (xfs_sb_version_hascrc(&mp->m_sb)) 398 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0, 399 agno, XFS_BTREE_CRC_BLOCKS); 400 else 401 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0, 402 agno, 0); 403 404 error = xfs_bwrite(bp); 405 xfs_buf_relse(bp); 406 if (error) 407 goto error0; 408 409 /* 410 * FINO btree root block 411 */ 412 if (xfs_sb_version_hasfinobt(&mp->m_sb)) { 413 bp = xfs_growfs_get_hdr_buf(mp, 414 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)), 415 BTOBB(mp->m_sb.sb_blocksize), 0, 416 &xfs_inobt_buf_ops); 417 if (!bp) { 418 error = -ENOMEM; 419 goto error0; 420 } 421 422 if (xfs_sb_version_hascrc(&mp->m_sb)) 423 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC, 424 0, 0, agno, 425 XFS_BTREE_CRC_BLOCKS); 426 else 427 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0, 428 0, agno, 0); 429 430 error = xfs_bwrite(bp); 431 xfs_buf_relse(bp); 432 if (error) 433 goto error0; 434 } 435 436 } 437 xfs_trans_agblocks_delta(tp, nfree); 438 /* 439 * There are new blocks in the old last a.g. 440 */ 441 if (new) { 442 /* 443 * Change the agi length. 444 */ 445 error = xfs_ialloc_read_agi(mp, tp, agno, &bp); 446 if (error) { 447 goto error0; 448 } 449 ASSERT(bp); 450 agi = XFS_BUF_TO_AGI(bp); 451 be32_add_cpu(&agi->agi_length, new); 452 ASSERT(nagcount == oagcount || 453 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 454 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 455 /* 456 * Change agf length. 457 */ 458 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); 459 if (error) { 460 goto error0; 461 } 462 ASSERT(bp); 463 agf = XFS_BUF_TO_AGF(bp); 464 be32_add_cpu(&agf->agf_length, new); 465 ASSERT(be32_to_cpu(agf->agf_length) == 466 be32_to_cpu(agi->agi_length)); 467 468 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 469 /* 470 * Free the new space. 471 */ 472 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, 473 be32_to_cpu(agf->agf_length) - new), new); 474 if (error) { 475 goto error0; 476 } 477 } 478 479 /* 480 * Update changed superblock fields transactionally. These are not 481 * seen by the rest of the world until the transaction commit applies 482 * them atomically to the superblock. 483 */ 484 if (nagcount > oagcount) 485 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); 486 if (nb > mp->m_sb.sb_dblocks) 487 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, 488 nb - mp->m_sb.sb_dblocks); 489 if (nfree) 490 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); 491 if (dpct) 492 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); 493 xfs_trans_set_sync(tp); 494 error = xfs_trans_commit(tp); 495 if (error) 496 return error; 497 498 /* New allocation groups fully initialized, so update mount struct */ 499 if (nagimax) 500 mp->m_maxagi = nagimax; 501 if (mp->m_sb.sb_imax_pct) { 502 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; 503 do_div(icount, 100); 504 mp->m_maxicount = icount << mp->m_sb.sb_inopblog; 505 } else 506 mp->m_maxicount = 0; 507 xfs_set_low_space_thresholds(mp); 508 509 /* update secondary superblocks. */ 510 for (agno = 1; agno < nagcount; agno++) { 511 error = 0; 512 /* 513 * new secondary superblocks need to be zeroed, not read from 514 * disk as the contents of the new area we are growing into is 515 * completely unknown. 516 */ 517 if (agno < oagcount) { 518 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, 519 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 520 XFS_FSS_TO_BB(mp, 1), 0, &bp, 521 &xfs_sb_buf_ops); 522 } else { 523 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp, 524 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 525 XFS_FSS_TO_BB(mp, 1), 0); 526 if (bp) { 527 bp->b_ops = &xfs_sb_buf_ops; 528 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 529 } else 530 error = -ENOMEM; 531 } 532 533 /* 534 * If we get an error reading or writing alternate superblocks, 535 * continue. xfs_repair chooses the "best" superblock based 536 * on most matches; if we break early, we'll leave more 537 * superblocks un-updated than updated, and xfs_repair may 538 * pick them over the properly-updated primary. 539 */ 540 if (error) { 541 xfs_warn(mp, 542 "error %d reading secondary superblock for ag %d", 543 error, agno); 544 saved_error = error; 545 continue; 546 } 547 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb); 548 549 error = xfs_bwrite(bp); 550 xfs_buf_relse(bp); 551 if (error) { 552 xfs_warn(mp, 553 "write error %d updating secondary superblock for ag %d", 554 error, agno); 555 saved_error = error; 556 continue; 557 } 558 } 559 return saved_error ? saved_error : error; 560 561 error0: 562 xfs_trans_cancel(tp); 563 return error; 564 } 565 566 static int 567 xfs_growfs_log_private( 568 xfs_mount_t *mp, /* mount point for filesystem */ 569 xfs_growfs_log_t *in) /* growfs log input struct */ 570 { 571 xfs_extlen_t nb; 572 573 nb = in->newblocks; 574 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) 575 return -EINVAL; 576 if (nb == mp->m_sb.sb_logblocks && 577 in->isint == (mp->m_sb.sb_logstart != 0)) 578 return -EINVAL; 579 /* 580 * Moving the log is hard, need new interfaces to sync 581 * the log first, hold off all activity while moving it. 582 * Can have shorter or longer log in the same space, 583 * or transform internal to external log or vice versa. 584 */ 585 return -ENOSYS; 586 } 587 588 /* 589 * protected versions of growfs function acquire and release locks on the mount 590 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, 591 * XFS_IOC_FSGROWFSRT 592 */ 593 594 595 int 596 xfs_growfs_data( 597 xfs_mount_t *mp, 598 xfs_growfs_data_t *in) 599 { 600 int error; 601 602 if (!capable(CAP_SYS_ADMIN)) 603 return -EPERM; 604 if (!mutex_trylock(&mp->m_growlock)) 605 return -EWOULDBLOCK; 606 error = xfs_growfs_data_private(mp, in); 607 /* 608 * Increment the generation unconditionally, the error could be from 609 * updating the secondary superblocks, in which case the new size 610 * is live already. 611 */ 612 mp->m_generation++; 613 mutex_unlock(&mp->m_growlock); 614 return error; 615 } 616 617 int 618 xfs_growfs_log( 619 xfs_mount_t *mp, 620 xfs_growfs_log_t *in) 621 { 622 int error; 623 624 if (!capable(CAP_SYS_ADMIN)) 625 return -EPERM; 626 if (!mutex_trylock(&mp->m_growlock)) 627 return -EWOULDBLOCK; 628 error = xfs_growfs_log_private(mp, in); 629 mutex_unlock(&mp->m_growlock); 630 return error; 631 } 632 633 /* 634 * exported through ioctl XFS_IOC_FSCOUNTS 635 */ 636 637 int 638 xfs_fs_counts( 639 xfs_mount_t *mp, 640 xfs_fsop_counts_t *cnt) 641 { 642 cnt->allocino = percpu_counter_read_positive(&mp->m_icount); 643 cnt->freeino = percpu_counter_read_positive(&mp->m_ifree); 644 cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) - 645 XFS_ALLOC_SET_ASIDE(mp); 646 647 spin_lock(&mp->m_sb_lock); 648 cnt->freertx = mp->m_sb.sb_frextents; 649 spin_unlock(&mp->m_sb_lock); 650 return 0; 651 } 652 653 /* 654 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS 655 * 656 * xfs_reserve_blocks is called to set m_resblks 657 * in the in-core mount table. The number of unused reserved blocks 658 * is kept in m_resblks_avail. 659 * 660 * Reserve the requested number of blocks if available. Otherwise return 661 * as many as possible to satisfy the request. The actual number 662 * reserved are returned in outval 663 * 664 * A null inval pointer indicates that only the current reserved blocks 665 * available should be returned no settings are changed. 666 */ 667 668 int 669 xfs_reserve_blocks( 670 xfs_mount_t *mp, 671 __uint64_t *inval, 672 xfs_fsop_resblks_t *outval) 673 { 674 __int64_t lcounter, delta, fdblks_delta; 675 __uint64_t request; 676 677 /* If inval is null, report current values and return */ 678 if (inval == (__uint64_t *)NULL) { 679 if (!outval) 680 return -EINVAL; 681 outval->resblks = mp->m_resblks; 682 outval->resblks_avail = mp->m_resblks_avail; 683 return 0; 684 } 685 686 request = *inval; 687 688 /* 689 * With per-cpu counters, this becomes an interesting 690 * problem. we needto work out if we are freeing or allocation 691 * blocks first, then we can do the modification as necessary. 692 * 693 * We do this under the m_sb_lock so that if we are near 694 * ENOSPC, we will hold out any changes while we work out 695 * what to do. This means that the amount of free space can 696 * change while we do this, so we need to retry if we end up 697 * trying to reserve more space than is available. 698 */ 699 retry: 700 spin_lock(&mp->m_sb_lock); 701 702 /* 703 * If our previous reservation was larger than the current value, 704 * then move any unused blocks back to the free pool. 705 */ 706 fdblks_delta = 0; 707 if (mp->m_resblks > request) { 708 lcounter = mp->m_resblks_avail - request; 709 if (lcounter > 0) { /* release unused blocks */ 710 fdblks_delta = lcounter; 711 mp->m_resblks_avail -= lcounter; 712 } 713 mp->m_resblks = request; 714 } else { 715 __int64_t free; 716 717 free = percpu_counter_sum(&mp->m_fdblocks) - 718 XFS_ALLOC_SET_ASIDE(mp); 719 if (!free) 720 goto out; /* ENOSPC and fdblks_delta = 0 */ 721 722 delta = request - mp->m_resblks; 723 lcounter = free - delta; 724 if (lcounter < 0) { 725 /* We can't satisfy the request, just get what we can */ 726 mp->m_resblks += free; 727 mp->m_resblks_avail += free; 728 fdblks_delta = -free; 729 } else { 730 fdblks_delta = -delta; 731 mp->m_resblks = request; 732 mp->m_resblks_avail += delta; 733 } 734 } 735 out: 736 if (outval) { 737 outval->resblks = mp->m_resblks; 738 outval->resblks_avail = mp->m_resblks_avail; 739 } 740 spin_unlock(&mp->m_sb_lock); 741 742 if (fdblks_delta) { 743 /* 744 * If we are putting blocks back here, m_resblks_avail is 745 * already at its max so this will put it in the free pool. 746 * 747 * If we need space, we'll either succeed in getting it 748 * from the free block count or we'll get an enospc. If 749 * we get a ENOSPC, it means things changed while we were 750 * calculating fdblks_delta and so we should try again to 751 * see if there is anything left to reserve. 752 * 753 * Don't set the reserved flag here - we don't want to reserve 754 * the extra reserve blocks from the reserve..... 755 */ 756 int error; 757 error = xfs_mod_fdblocks(mp, fdblks_delta, 0); 758 if (error == -ENOSPC) 759 goto retry; 760 } 761 return 0; 762 } 763 764 int 765 xfs_fs_goingdown( 766 xfs_mount_t *mp, 767 __uint32_t inflags) 768 { 769 switch (inflags) { 770 case XFS_FSOP_GOING_FLAGS_DEFAULT: { 771 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); 772 773 if (sb && !IS_ERR(sb)) { 774 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 775 thaw_bdev(sb->s_bdev, sb); 776 } 777 778 break; 779 } 780 case XFS_FSOP_GOING_FLAGS_LOGFLUSH: 781 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 782 break; 783 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: 784 xfs_force_shutdown(mp, 785 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); 786 break; 787 default: 788 return -EINVAL; 789 } 790 791 return 0; 792 } 793 794 /* 795 * Force a shutdown of the filesystem instantly while keeping the filesystem 796 * consistent. We don't do an unmount here; just shutdown the shop, make sure 797 * that absolutely nothing persistent happens to this filesystem after this 798 * point. 799 */ 800 void 801 xfs_do_force_shutdown( 802 xfs_mount_t *mp, 803 int flags, 804 char *fname, 805 int lnnum) 806 { 807 int logerror; 808 809 logerror = flags & SHUTDOWN_LOG_IO_ERROR; 810 811 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 812 xfs_notice(mp, 813 "%s(0x%x) called from line %d of file %s. Return address = 0x%p", 814 __func__, flags, lnnum, fname, __return_address); 815 } 816 /* 817 * No need to duplicate efforts. 818 */ 819 if (XFS_FORCED_SHUTDOWN(mp) && !logerror) 820 return; 821 822 /* 823 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't 824 * queue up anybody new on the log reservations, and wakes up 825 * everybody who's sleeping on log reservations to tell them 826 * the bad news. 827 */ 828 if (xfs_log_force_umount(mp, logerror)) 829 return; 830 831 if (flags & SHUTDOWN_CORRUPT_INCORE) { 832 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT, 833 "Corruption of in-memory data detected. Shutting down filesystem"); 834 if (XFS_ERRLEVEL_HIGH <= xfs_error_level) 835 xfs_stack_trace(); 836 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 837 if (logerror) { 838 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR, 839 "Log I/O Error Detected. Shutting down filesystem"); 840 } else if (flags & SHUTDOWN_DEVICE_REQ) { 841 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, 842 "All device paths lost. Shutting down filesystem"); 843 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) { 844 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, 845 "I/O Error Detected. Shutting down filesystem"); 846 } 847 } 848 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 849 xfs_alert(mp, 850 "Please umount the filesystem and rectify the problem(s)"); 851 } 852 } 853